Friction draft-rigging.



PATENTED JUNE 14, 1 904.

F. B. TOWNSEND. FRICTION DRAFT RIGGING.

APPLICATION FILED FEB. 18,1904.

2 SHEETS-SHEET 1.

NO MODEL.

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I. B. TOWNSEND.

FRIGTION DRAFT RIGGING.

APPLIOATION FILED I'EB. 18.1904.

N0 MODEL.

. WITNESSES.-

UNITED STAT S Patented June 14, 1904.

PATENT OFFICE.

FREDERICK B. TOWNSEND, OF CHICAGO, ILLINOIS, ASSIGNOR TO V. H. MINERCOMPANY, OF CHICAGO, ILLINOIS, A CORPORA- TION OF ILLINOIS.

FRICTION DRAFT-RIGGING.

SPECIFICATION forming part of Letters Patent No. 762,505, dated June 14,1904.

Application filed February 18,1904. Serial No. 194,208. (No model.)

cago, in the county of Cook and State of Illinois, have invented a newand useful Improvement in Friction Draft-Rigging, of which the followingis a specification.

My invention relates to improvements in friction draft-rigging for.railway-cars.

The object of my invention is to provide a friction draft-rigging of asimple,eflicient,and durable construction, composed of few parts capableof being readily and quickly put together or assembled on the car andremoved from the car, and which will cushion pulling and buffing strainsbothby the direct action of the longitudinally-arranged spring and bythe frictional resistance cooperating therewith. 7

My invention consists in the novel construction of parts and devices andin the novel combinations of parts and devices herein shown anddescribed, by which this result is accomplished.

In the accompanying drawings, forming a part of this specification,Figure 1 is a central vertical longitudinal section on line 1 l of Fig.2, partly in elevation, of a friction draft-rigging embodying myinvention. Fig. 2 is a horizontal section on line 2 2 of Fig. 1. Fig. 3is a cross-section on line 3 3 of Fig. 2. Fig. 4 is a cross-section online 4: L of Fig. 2. Fig. 5 is a detail perspective view of one of thefriction-blocks. Fig. 6 is a detail elevation of one of the wedges, andFig. 7 is a detail end view of one of the wedges.

In the drawings, A A represent the center sills, draft-timbers, orframework of the car to which the draft-rigging is to be attached; A,the cross-sill; A the buffer-plate, and A the carry-iron.

Bis the coupler, having a draw-bar B, a draw-bar extension or yoke Bsecurely attached thereto by the bolts or rivets b, and interengagingshoulders 6 5 C and C are front and rear followers actuated by thedraw-bar and draw-bar entension and alternately moving with the draw-barand held stationary by the stops or shoulders (Z d on the stop-castingsD D, which are rigidly and firmly secured to the draft-timbers or centersills of the car-framework. The side plates or stop-castings D D eachhave an upper flange or guide (Z preferably integral therewith and aremovable guide or plate (Z to guide the followers and support the sameand through them the draw-bar-extension spring and other parts.

E is the longitudinally-arranged spring directly behind the draw-bar andin the line of draft and cooperating with the followers andstop-castings to cushion both bufling and pulling strains by its directaction. 7

F is a sliding friction shell or case interposed between the followers CC and embraced between and supported or guided by the upper and lowerlimbs of the draw-bar extension or yoke B This sliding frictionshell Fincloses and surrounds the spring E and has a closed rear end f, againstwhich the rear end of the spring abuts, the friction-shell being thusinterposed between the spring and the rear follower. The friction-shellF has four interior friction-faces f longitudinally parallel to thedraw-bar or the line of draft and slightly inwardly raised or projectingin respect to the interior surface f of the shell which embraces thespring E to enable the friction-faces to wear away without forming ashoulder for the longitudinally-sliding fric' tion-blocks H'H to abutagainst at the ends thereof. The longitudinally-sliding frictionblocks HH are preferably four in number, each having an exterior friction-face hengaging a corresponding interior friction-face f of the friction shellor case F. Each of the longitudinally-shding friction-blocks H H haswedging or inclined faces 7!, [L2 at the opposite ends thereof, whichengage the oppositely-disposed wedges G G. Each of the wedges Cr C hasfour wedging or inclined faces 9 g, one for each of the slidingfriction-blocks H H. The wedge G abuts against the front follower C, andthe wedge Gr abuts against'the front end of the spring E. Aconnecting-bolt or rivet-pin G extending longitudinally through thewedges, connects the same and holds them together in position,

and an encircling spring or band H, fitting in anexteriorcircumferentialgroove orchannel 7b in the slidingfriction-blocks H, connects the four frictionblocks together, so thatthe four friction-blocks H H and two wedges G G are thus all heldconnected together and in position and may be inserted in operativeposition in the friction-shell F and removed therefrom all as one pieceand very readily and quickly. The connecting-bolt or rivetpin G has athimble r/ to serve as a guide for the smaller spring a, which ispreferably employed within the large springE. The closed end plate f ofthe friction-shell F is also fur nished with an integral boss f" toserve as a guide for the rear end of the spring to hold it in place.

The friction shell or case F is provided with external circular ribssurroundingits friction-surface end or portion to strengthen the sameagainst the outward pressure or bursting strain exerted against the sameby the friction-blocks H under action of the wedges G G and springs E c.As before stated, the friction shell or case F is guided and held inplace against vertical movement by the upper and lower limbs of thedraw-bar extension or yoke B and it is guided or held in positionlaterally or against sidewise movement by bosses, guides, or projections(Z, preferably two in number, on each of the side plates orstop-castings D. The longitudinally-sliding friction-blocks H H arecontained in and confined from lateral or outward movement by thelongitudinallysliding friction shell or case F. The oppositely-disposedwedges G G engage the friction-blocks H H and move longitudinally withthe same while causing the friction-blocks to be forcibly pressedagainst and to frietionally grip the longitudinallysliding shell F. Inbuffing the front follower moves with the draw-bar and causes the twowedges and the friction bloeks to likewise move with the draw-bar, whilethe frictionshell F and rear follower are held stationary by engagementwith the rear stops of the stop-casting. In pulling, and friction-shellmove longitudinally with the draw-bar, while the front follower, the twowedges G G, and the friction-blocks H H are held stationary by the frontstops on i the side plates or stop-castings.

I cla1m 1. In a friction draft-rigging, the combination with a draw-bar,a draw-bar extension, side plates or sto 'i-castings, followers, alongitudinally-arranged spring between the followers, alongitudinally-s1iding friction shell the rear follower nished each withwedging 0r inclined faces at each end thereof, and a pair ofoppositelydisposed wedges, one at each end of the friction-blocks, oneinterposed between the friction-blocks and one of the followers, and theother interposed between the friction-blocks and one end of the spring,substantially as specified.

2. In a friction draft-rigging, the combination with a draw-bar, adraw-bar extension, side plates or stop-castings, followers, alongitudinally-arranged spring between the followers, alongitudinally-sliding friction shell or case having one closed endengaging one of the followers, and against which one end of the springabuts, and furnished with interior friction-faces, a plurality offrictionblocks having exterior friction-faces in sliding frictionalengagement with the interior friction-faces of the shell or case, andfurnished each with wedging or inclined faces at each end thereof, and apair of oppositelydisposed wedges, one at each end of thefriction-blocks, one interposed between the friction-blocks and one ofthe followers, and the other interposed between the friction-blocks andone end of the spring, said side plates or stop-castings having bossesor projections to guide and hold laterally in position the frictionshell or case, substantially as specified.

3. In a friction draft-rigging, the combination with a draw-bar, adraw-bar extension, side plates or stop-castings, followers, alongitudinally-arranged spring between the followers, alongitudinally-sliding friction shell or case having one closed endengaging one of the followers, and against which one end of the springabuts, and furnished with interior friction-faces, a plurality offriction-blocks having exterior friction-faces in sliding frictionalengagement with the interior frictionfaces of the shell or case, andfurnished each with wedging or inclined faces at each end thereof, and apair of oppositely-disposed wedges, one at each end of thefriction-blocks, one interposed between the friction-blocks and one ofthe followers, and the other interposed between the friction-blocks andone end of the spring, a band encircling the friction-blocks and alongitudinally-extending pin orbolt connecting the wedges, substantiallyas specified.

4. In a friction-spring draft-rigging, the combination with a draw-barand a draw-bar yoke, of side plates or stop-castings, followers, alongitudinally-arranged spring between the followers, alongitudinally-slidingfriction shell or case having interiorfriction-surfaces and provided with external circular ribs surroundingthe same, a plurality of sliding friction-blocks inside the shell andhaving exterior friction-faces and a pair of oppositely-disposed wedges,substantially as specified.

5. In a friction-spring draft-rigging, the combination with a draw-bar,a draw-bar yoke, of side plates or stop-castings, followers, alongitudinally-arranged spring between the followers, alongitudinally-sliding friction shell or case having interiorfriotion-surfaces and provided with external circular ribs surroundingthe same, a plurality of sliding friction-blocks inside the shell andhaving exterior friction-faces and a pair of oppositelydisposed wedges,said friction shell or case having one closed end engaging one of thefollowers and against which one end of the spring abuts, substantiallyas specified.

6. In a friction-spring draft-rigging, the combination with a draw-barand draw-bar extension, of side plates or stop-castings, followers, alongitudinally-arranged spring between followers, a sliding frictionshell or case having interior friction-surfaces, a plurality offriction-blocks inside the shell, and having exterior friction-faces, apair of oppositelydisposed wedges and a longitudinally-extendingconnecting bolt or pin for the wedges, substantially as specified.

, 7. In a friction-spring draft-rigging, the combination with adraw-bar, and draw-bar extension, of side plates or stop-castings,followers, a longitudinally-arranged spring between followers, a slidingfriction shell or case having interior friction-surfaces, a plurality offriction-blocks inside the shell, and having exterior friction-faces, apair of oppositelydisposed wedges and a longitudinally-extendingconnecting belt or pin for the wedges, said friction-blocks having anexternal circumferential groove and a spring or band fitting of theyoke, a plurality of longitudinally-sliding friction-blocks inside thecase, a wedge to cause the blocks to frictionally engage the shell orcase, said side plates or stop-castings having integralinwardly-extending bosses 01' projections to guide the shell or case andhold it in position laterally, substantially as specified.

FREDERICK B. TOWNSEND.

WVitnes'ses:

H. M. MUNDAY, EDMUND ADCOCIL.

